The 10-page document outlines a mile-long laundry list of uncharged past crimes that the DA’s Office wants to present to bolster its murder conspiracy case against the 67-year-old former FBI bigwig.

DeVecchio faces the rest of his life in prison if he’s found guilty of dishing classified information to Colombo crime-family informant Gregory “The Grim Reaper” Scarpa that led to four mob murders.

DeVecchio allegedly passed the tidbits to Scarpa in exchange for the bribes, as well as to garner information on the mob’s dealings so he could bring it back to the FBI to make himself look good. Scarpa allegedly used his classified info to help pull off the four hits.

The new document claims that prosecutors have evidence of an additional murder – that of a Queens abortion doctor who’d threatened to report Scarpa to the IRS. It also details DeVecchio’s alleged acceptance of “gifts” from the mob – wine, $66,000 in FBI funds earmarked for informant Scarpa and the services of a prostitute at a now-defunct Staten Island hotel.

In the 1980s, Scarpa twice directed his men to “arrange at [his] expense for a hotel room, champagne and the services of a prostitute for the defendant,” the letter said.

DeVecchio also was given jewelry that he “knew . . . members of Scarpa Sr.’s crew had taken during a burglary of bank safety deposit boxes,” the feds charged.

It also was alleged that some of DeVecchio’s tips to Scarpa involved the feds’ surveillance of his Wimpy Boys Social Club. At one point, he reportedly called Scarpa’s girlfriend a “stand-up broad” when she kept mum during a Justice Department probe.

“Those are absolutely and unequivocally false,” said DeVecchio lawyer Mark Bederow of the allegations in the letter.

News of the DA’s reserve ammunition surfaced shortly after DeVecchio waived his right to a jury and put his fate in the hands of the judge, a former ’60s radical with ample reason to distrust snooping G-men.

“I wanted to have this trial in front of an impartial, intelligent individual who can assess the facts the way they are presented, which will mitigate in my favor,” DeVecchio told Brooklyn Supreme Court Justice Gustin Reichbach.

Even the judge, a maverick figure in the Brooklyn courthouse who has served on war crimes tribunals in Kosovo, called the decision “a generally unwise step.”